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` SEQUOIA ANALYTICAL <br /> 93 <br /> 680 Chesapeake Drive Redwood City, C <br /> (415) 364-9600 FAX(415) 364-9233 <br /> 1 <br /> iRESNA <br /> n k <br /> r i`FG.�i.+".r svn 4.trx'iM.vn+.W4i+�+�%.C�.}srFir'�'Fvw.J{r 4JflivFiA�'r. mrr•rn �a \ka..iv�`nNYSew�vs+� r �.+.�`w.i'CAixi.SiS.,nY+C+.[[�a��i4 41.x.9 <br /> Client Project ID W0475,SWel�er Point ({ <br /> 1710 Main Street <br /> Escalon, CA 95320 y <br /> �>;Attention Tina LePage QC Sample Group 206-3320 Reported Jun 23, 1932 <br /> ' Au,.[,«^ry rpviri n +4+'vw w.r NS[Yw vn.nw Avvv}'rv�"1rt F+ti. H1 aur.Y}[ aPss+ 4 }}4`,.[M.viavy�rVrw o.tx v}+�*+Y�Ih aY•k+Y'r..[.Y;++rry afar ing-ow <br /> c.tr 9�s uvh <br /> QUALITY CONTROL DATA REPORT <br /> 1 ANALYTE Ethyl- <br /> Benzene Toluene benzene X enes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst M Nipp M Nipp M Nipp M Nipp <br /> Reporting Units p9/L ug/L v9/L u9/L <br /> ' Date Analyzed Jun 18, 1992 Jun 18, 1992 Jun 18, 1992 Jun 18, 1992 <br /> QC Sample# GBLK061892 GBLK061892 GBLK061892 GBLK061892 <br /> MS/MSD MS/MSD MS/MSD MS/MSD <br /> ' Sample Conc: N D N D N D N D <br /> Spike Conc. <br /> Added: 10 10 10 30 <br /> ' Conc Matrix <br /> Spike, 11 11 11 33 <br /> Matrix Spike <br /> % Recovery: 110 110 110 110 <br /> ' Conc. Matrix <br /> Spike Dup.: 12 12 12 35 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 120 120 120 117 <br /> ' Relative <br /> % Difference: 87 87 87 59 <br /> SEQUOIA ANALYTICAL %Recovery' Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> anj Relative%Difference Conc of M S -Cone of M S D x 100 <br /> ria Le (Conc of M S + Conc of M S D) 2 <br /> roject Manager 206&MWAT <2> <br />